Читать книгу Geochemistry - William M. White - Страница 36

The Redlich-Kwong equation (1949) expresses the attractive forces as a more complex function:

(2.15)

The Virial equation is much easier to handle algebraically than the van der Waals equation and has some theoretical basis in statistical mechanics:

(2.16)

Table 2.1 Van der Waals constants for selected gases.

Gas	a liter-atm/mole2	b liter/mole
Helium	0.034	0.0237
Argon	1.345	0.0171
Hydrogen	0.244	0.0266
Oxygen	1.360	0.0318
Nitrogen	1.390	0.0391
Carbon dioxide	3.592	0.0399
Water	5.464	0.0305
Benzene	18.00	0.1154

A, B, C, .... are empirically determined (temperature-dependent) constants.